Bug#1145118: adios4dolfinx: FTBFS: E ValueError: [Sat Aug 22 10:11:38 2026] [ADIOS2 EXCEPTION] : A serial HDF5 engine cannot be used with a communicator that is MPI-based.

[Francesco Ballarin]

Source: adios4dolfinx
Followup-For: Bug #1145118


This should be now fixed in unstable, thanks to the patch in #1147536 to adios2.